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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e520942db6ee1e455ff8c8dc4be1dbef41767e42103040f24b0b1426cc983a' 
  AND token = '5kY19DG+3dj8uLUJ60KnwMrn2WQGB5AX4yPQ6ScGHlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}